customise protocol

Hello everyone Project detail i have developed Our company Standard PLC supports Modbus protocol for Master slave communication. I had design scheme through which PLC ladder programmer can define their required protocol for different slaves. For this i have design scheme where user can sets its own Header,Data, Trailer, Error package settings. I have develop SW which supports our company standrd ladder programming , where user can select time scale , number of data bytes , where data store & It also displays different errors in communication . I have Exp of 1 year n more in Application n driver programming in LPC2478 , Nuvoton M051 serise and Renesas 25-26 series. Thnks shivang5055ATgmailDOTcom